Optimization methods As for the optimization methods, we adopt the nestrov-like acceleration method for non-convex optimization algorithm [1]}, [2]}, [3]} for training linear model composed with softmax and we adopt adam to train deep neural networks. We adopt SGD method to train the models for User-Imb dataset, while we use the adam[4]}, [5]} to train the models for the CIFAR-100-Imb dataset.
